Add range steps' display options for forms slider component with default and
dotted variants. Show range steps below the input by adding markup items in
the number of range steps, but without the need to introduce new styles for
each use.
Part of #94707
Add default checkbox markup and style overrides to the form component,
complying with default checkbox markup conventions. Add style overrides to
cleanup and simplify base styling.
Initialize cleanup of forms styles and forms examples on the reference page.
Remove redundant examples and specific styles that can cause issues in projects
context.
